When an object is thrown into the air, when the object is at its peak height, is the acceleration 0 or is it still free fall, 9.81 m/s^2?
回答 (4)
2016-10-17 11:05 pm
✔ 最佳答案
The acceleration is caused by the object's weight. Since it always, has weight, the acceleration toward the earth is always 9.81 m/s^2. 
2016-10-17 10:55 pm
V = 0
a = g = 9.806 m/sec^2 directed downward
a = g = 9.806 m/sec^2 directed downward
2016-10-17 11:03 pm
Spock's grampa was wrong. The instant accel is still 9.81 m/s^2 downward.
2016-10-17 10:53 pm
by definition, at peak, the instantaneous change in height is zero. gravity still works, however, and that force will soon cause it to return. the instant accel is zero, but will soon increase
參考: grampa
收錄日期: 2021-05-01 21:13:58
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https://hk.answers.yahoo.com/question/index?qid=20161017141712AAVdiaR